* include/functions_groups.php: added first version of file with the
function "checkUsedGroup".
*include/Image/Canvas.php, include/Image/Canvas/GD.php,
include/functions.php, mobile/operation/agents/view_agents.php: cleaned
source code style.
* godmode/groups/group_list.php: fixed the check if the group to delete is
empty.
Fixes: #3074223
git-svn-id: https://svn.code.sf.net/p/pandora/code/trunk@3320 c3f86ba8-e40f-0410-aaad-9ba5e7f4b01f
mdtrooper